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    FCC-ee top-up injection

    → Europe/Zurich
    FCC-ee top-up injection
    Zoom Meeting ID
    66156014911
    Host
    Yann Dutheil
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    Participants : H. Bartosik, Y. Dutheil, K. Skoufaris

    • PB and BTC rematch for D=0 seem OK, will need to confirmed by all stakeholders
      • question of the PB chicane asymmetry : is it a required feature or can it be made the two sides are parallel ? -> question for Pantaleo
      • The PB rematch was done for the regular lattice, and should be checked for the other ring
      • R56 and beam frame rotation are very small, but should be kept in mind
    • Discussions with the booster team for beam requirement must be undertook
      • need to study the impact of transverse emittance from the booster
      • what are the requirements on the emittance and bunch-to-bunch spread ?
      • what is the required flux for the collider ?
      • important to conduct those sensitivity studies in the presence of beam-beam
    • First stage could be how to inject this beam : on-axis, off-axis, hybrid ... ? possibly to understand beam losses, and emittance increase
    • second stage once a promising scheme is identified scan sensitivity to emittance
    • Aiming for a clear study plan over the next 2 weeks, to be discussed again at the next top-up meeting
    • earlier work from Kevin Andre excluded the off-axis scheme, but since then significant work was done on the insertion optimisation to improve this, even in off-axis
    • question of the dispersion wave mismatch of the injection bump
      • addressed in ABT collider injection repo here 
      • estimated at about 0.2%

     

    There are minutes attached to this event. Show them.
      • 09:00 → 09:20
        BTC matching and PB layout follow-up 20m
        • Follow-up from discussion on 29/10
        • R56 bunch lengthening and beam frame rotation impact quite small -> is neglecting OK for everyone ?
        • BTC rematch for off-axis injection
        • PB optics rematch with zero dispersion, first try upon Pantaleo's suggestion to leak dispersion from the arcs
        • Next steps
          • converge on the layout and design of BTC -> aiming at a layout in the acc-models by the end of November
          • Validate a new BTC layout with booster extraction scheme
          • Continue PB optics review with Pantaleo and ABP, and port to LCC108